Question

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How do you check if a string contains only digits?​

Answer 1

Answer:

Given a string str, the task is to write a Java program to check whether a string contains only digits or not. If so, then print true, otherwise false.

Example :

1. Input: str = “1234”

Output: true

Explanation:

The given string contains only digits so that output is true.

2. Input: str = “GeeksforGeeks2020”

Output: false

Explanation:

The given string contains alphabet character and digits so that output is false.

Answer 2

Explanation:

Use str. isdecimal() to check if a string contains only numbers. Call the built-in str. isdecimal() method on the target string str to return a boolean value that represents whether all characters of the string are numeric digits or not.

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